Metallics JRM82SLT 6-32 x 1-1/2 in. Round Head Slotted Machine Screws - Steel Zinc - Each

Metallics lists the JRM82SLT as compliant for both ARRA and Buy American, with country of origin China. On a federally funded project the compliance flag and the origin need to be reconciled against your specific contract clause before the submittal goes in, because the two provisions treat origin differently.

Round head sits proud of the surface with a domed crown, so it is a bearing/clamping head, not a flush one. The JRM82SLT head measures 0.24 to 0.26 in. across with a head height of 0.091 to 0.103 in. If you need the screw to disappear into a countersunk cover plate, round head is the wrong profile and you want an oval or flat head instead. The slotted drive takes a standard flat blade, which is why it is still the default on electrical device work.

These are low carbon steel screws to AISI 1006-1022 with a 60,000 psi minimum tensile strength and a hardness of Rockwell B70-B100. That is standard commercial machine screw material, fine for mounting devices, plates, brackets, and light enclosure work. For a structural or high-torque fastening, step up to a hardened or socket cap fastener rather than a mild steel slotted screw.

Zinc plating over steel is an indoor/dry-location finish. It handles handling and storage corrosion but will rust in wet, washdown, coastal, or buried-conduit conditions. For exterior boxes, pool rooms, or food plant washdown, specify a stainless 6-32 round head slotted screw instead of the zinc version.

They ship 100 to a jar, and 100 count is the order minimum. The jar packaging is what makes them practical on a service van or a shop bench, since you can pour out a handful without a bag tearing open in a bin. Net weight of the container is 0.56 lbs.

A machine screw like the 6-32 JRM82SLT has a uniform 32 threads per inch along its full length and needs an existing tapped hole or a nut, which is exactly how electrical boxes, plaster rings, and enclosure bosses are made. A sheet metal screw cuts its own thread in an untapped hole and will strip a factory 6-32 tapped boss. If the hole is already threaded, use the machine screw.